U.S. patent application number 11/291237 was filed with the patent office on 2006-03-23 for latex glove with fabric-adherent cuff region.
This patent application is currently assigned to ANSELL HEALTHCARE PRODUCTS LLC. Invention is credited to Paul Cacioli, Soo Hwa Kwan, Hee Meng Lai.
Application Number | 20060059604 11/291237 |
Document ID | / |
Family ID | 36072249 |
Filed Date | 2006-03-23 |
United States Patent
Application |
20060059604 |
Kind Code |
A1 |
Lai; Hee Meng ; et
al. |
March 23, 2006 |
Latex glove with fabric-adherent cuff region
Abstract
A dipped and cured latex glove article, the inner cuff surface
of which is fabric-adherent, and a method of making such a glove
comprising dipping a coagulant-coated glove former into an aqueous
latex emulsion thereby forming a latex first layer on the former,
partially coating the latex first layer on the former with a
non-tacky aqueous polymeric emulsion, heating the former to cure
the first layer with the second layer, stripping from the former
and inverting the article, washing the article, dressing the
inverted latex glove article on a glove former such that the
fabric-adherent inner cuff surface contacts the former, treating
the surface of the article to minimize tackiness, stripping the
article from the former, washing the article, and drying the
article, after which the article can be packaged and sterilized by
exposing the packaged latex glove article to gamma radiation.
Inventors: |
Lai; Hee Meng; (Melaka,
MY) ; Kwan; Soo Hwa; (Melaka, MY) ; Cacioli;
Paul; (Eltham, AU) |
Correspondence
Address: |
GARDNER CARTON & DOUGLAS LLP;ATTN: PATENT DOCKET DEPT.
191 N. WACKER DRIVE, SUITE 3700
CHICAGO
IL
60606
US
|
Assignee: |
ANSELL HEALTHCARE PRODUCTS
LLC
Red Bank
NJ
|
Family ID: |
36072249 |
Appl. No.: |
11/291237 |
Filed: |
December 1, 2005 |
Current U.S.
Class: |
2/168 |
Current CPC
Class: |
A41D 19/0058 20130101;
A41D 2400/44 20130101; B29C 41/14 20130101; A41D 19/0082
20130101 |
Class at
Publication: |
002/168 |
International
Class: |
A41D 19/00 20060101
A41D019/00 |
Claims
1. A dipped and cured latex glove article comprising an integral
glove region and a cuff region, wherein said integral glove region
comprises an inner glove surface and an outer glove surface,
wherein said cuff region comprises an inner cuff surface and an
outer cuff surface, and wherein said inner glove surface is coated
with a non-tacky lubricious polymeric coating whereas said inner
cuff surface is not coated and is left in the dipped and cured
latex state, which is tacky, and wherein said outer glove surface
and said outer cuff surface are treated to minimize the tackiness
of the dipped and cured latex state, whereby said inner glove
surface enables easy dry- and wet-donning of the glove and the
tacky inner cuff surface adheres to a fabric sleeve when the glove
is donned over the end of the sleeve.
2. The article of claim 1, wherein said inner cuff region has a
width of about 0.5 cm to about 10 cm.
3. The article of claim 1, wherein said inner cuff region has a
width of about 1 cm to about 3 cm.
4. The article of claim 1, wherein said non-tacky lubricious
polymeric coating is a cured dip-coated film-forming polymeric
emulsion.
5. The article of claim 4, wherein the polymeric emulsion comprises
a wax and a surfactant.
6. The article of claim 4, wherein the polymeric emulsion is an
aqueous polyurethane polymeric emulsion.
7. The article of claim 6, wherein the polymeric emulsion comprises
a wax and a surfactant.
8. The article of claim 4, wherein the polymeric emulsion is an
aqueous acrylic polymeric emulsion.
9. The article of claim 8, wherein the polymeric emulsion comprises
a wax and a surfactant.
10. The article of claim 4, wherein the polymeric emulsion is an
aqueous siliconized polymeric emulsion comprising silicone
particles.
11. The article of claim 1, wherein the latex is natural.
12. The article of claim 11, wherein the latex is polyisoprene.
13. The article of claim 1, wherein the latex is synthetic.
14. The article of claim 13, wherein the latex is polyisoprene.
15. The article of claim 13, wherein the latex is nitrile
rubber.
16. The article of claim 13, wherein the latex is
styrene-isoprene-styrene block co-polymer.
17. The article of claim 13, wherein the latex is chloroprene.
18. The article of claim 13, wherein the latex comprises nitrile,
styrene-isoprene-styrene block co-polymer, chloroprene,
polyisoprene, or a combination of one or more of the foregoing.
19. A dipped and cured synthetic latex glove article, wherein the
synthetic latex comprises nitrile, styrene-isoprene-styrene block
co-polymer, chloroprene, or a combination of one or more of the
foregoing, wherein the glove article comprises an integral glove
region and a cuff region, wherein said integral glove region
comprises an inner glove surface and an outer glove surface,
wherein said cuff region comprises an inner cuff surface and an
outer cuff surface, and wherein said inner glove surface and inner
cuff surface are coated with synthetic polyisoprene, which is
tacky, wherein said inner glove surface is then coated with a
non-tacky lubricious polymeric coating whereas said inner cuff
surface is not coated and is left tacky, and wherein said outer
glove surface and said outer cuff surface are treated to minimize
the tackiness of the dipped and cured latex state, whereby said
inner glove surface enables easy dry- and wet-donning of the glove
and the tacky inner cuff surface adheres to a fabric sleeve when
the glove is donned over the end of the sleeve.
20. A method of making a latex glove article comprising an integral
glove region and a cuff region, which method comprises: (i) dipping
a coagulant-coated glove former into an aqueous latex emulsion,
thereby forming a latex first layer on the former, (ii) partially
coating the latex first layer on the former with a non-tacky
aqueous polymeric emulsion, thereby forming a second layer on top
of the latex first layer in the integral glove region but not in
the cuff region of the latex glove article, (iii) heating the
former with the first layer and the second layer to cure the first
layer with the second layer, after which the cuff region remains
tacky and the integral glove region becomes non-tacky, (iv)
stripping from the former and inverting the latex glove article,
(v) washing the latex glove article to remove coagulant, aqueous
latex surfactants, stabilizers, pH modifiers, and offensive
proteins, (vi) dressing the inverted latex glove article on a glove
former such that the surface of the glove with the tacky cuff
region and the non-tacky integral glove region contacts the former,
(vii) treating the surface of the latex glove article, which is not
in contact with the former and which comprises a tacky integral
glove region and a tacky cuff region, to minimize tackiness, (viii)
stripping the latex glove article from the former, (ix) washing the
latex glove article to remove any residue from (vii), and (x)
drying the latex glove article at 80.degree. C. for 1 hr, whereupon
a latex glove article is made.
21. The method of claim 20, wherein the partially coating in (ii)
is done by partially dipping.
22. The method of claim 20, wherein the treating in (vii) is with a
chlorination solution.
23. The method of claim 21, wherein the treating in (vii) is with a
chlorination solution.
24. The method of claim 20, which further comprises packaging the
latex glove article.
25. The method of claim 24, which further comprises sterilizing the
packaged latex glove article by exposing the packaged latex glove
article to gamma radiation.
26. A method of making a synthetic latex glove article comprising
an integral glove region and a cuff region, which method comprises:
(i) dipping a coagulant-coated glove former into an aqueous
synthetic latex emulsion comprising nitrile, synthetic
styrene-isoprene-styrene block co-polymer, chloroprene, or a
combination of one or more of the foregoing, thereby forming a
latex first layer on the former, (ii) dipping the former with the
latex first layer into a synthetic polyisoprene latex emulsion,
thereby forming a latex second layer on top of the latex first
layer in the integral glove region but not in the cuff region of
the latex glove article, (iii) partially coating the first layer
and the second layer on the former with a non-tacky aqueous
polymeric emulsion, thereby forming a third layer on top of the
latex first layer and the latex second layer in the integral glove
region but not in the cuff region of the latex glove article, (iv)
heating the former with the first layer, the second layer, and the
third layer to cure the first layer, the second layer, and the
third layer together, after which the cuff region remains tacky and
the integral glove region becomes non-tacky, (v) stripping from the
former and inverting the latex glove article, (vi) washing the
latex glove article to remove coagulant, aqueous latex surfactants,
stabilizers, pH modifiers, and offensive proteins, (vii) dressing
the inverted latex glove article on a glove former such that the
surface of the glove with the tacky cuff region and the non-tacky
integral glove region contacts the former, (viii) treating the
surface of the latex glove article, which is not in contact with
the former and which comprises a tacky integral glove region and a
tacky cuff region, to minimize tackiness, (ix) stripping the latex
glove article from the former, (x) washing the latex glove article
to remove any residue from (viii), and (xi) drying the latex glove
article at 80.degree. C. for 1 hr, whereupon a latex glove article
is made.
27. The method of claim 26, wherein the partially coating in (iii)
is done by partially dipping.
28. The method of claim 26, wherein the treating in (viii) is with
a chlorination solution.
29. The method of claim 27, wherein the treating in (viii) is with
a chlorination solution.
30. The method of claim 26, which further comprises packaging the
latex glove article.
31. The method of claim 30, which further comprises sterilizing the
packaged latex glove article by exposing the packaged latex glove
article to gamma radiation.
Description
TECHNICAL FIELD OF THE INVENTION
[0001] The present invention relates to a dipped and cured latex
glove article, the inner cuff surface of which is fabric-adherent,
and a method of making such a glove.
BACKGROUND OF THE INVENTION
[0002] Skin-contacting articles, such as gloves, particularly
medical gloves, are commonly used as a protective barrier against
the contamination of the user by chemicals, body fluids, and
micro-organisms, such as bacteria, viruses and the like. Such
articles also protect patients from contamination. In addition, the
gloves protect the user from injuries that result from abrasions,
cuts, and needle pricks. Consequently, such articles are
manufactured in such a way that they are entirely impermeable to
such insults. In other words, they are free from defects, such as
holes, including pinholes, and tears, and desirably are thin for
surgical applications and the like where tactile sensitivity is
necessary. This impermeability, however, prevents evaporation of
skin-generated moisture and moisture quickly accumulates between
the skin and the surface of the glove. When the glove is removed,
the skin-generated moisture evaporates quickly, leaving the skin
dry and prone to cracking and, consequently, susceptible to
infection. Moreover, allergic and other skin irritation reactions
are common, due to the presence of naturally occurring offensive
proteins in natural rubber latex, coagulants, and other processing
chemical residues in the rubber glove. In addition to providing
barrier protection, the gloves must be easy to don and doff. Such a
characteristic is particularly important in life-saving situations
where every second counts. There are three specific aspects of
donning related to medical gloves, in particular surgical gloves,
namely dry hand donning, damp-hand or wet-hand donning, and
double-gloving. If the user encounters difficulty in donning a
glove, the user typically gives up trying to don the particular
glove and selects a glove with superior donning, wasting time in
the process.
[0003] Surgical glove users normally wash their hands, put on their
surgical gowns, and then don surgical gloves immediately thereafter
in such a manner that the cuff of the surgical glove completely
encases the end of the sleeve of the surgical gown. Overlapping the
surgical gown with the surgical glove cuff prevents exposure of the
surgeon's skin to the patient and prevents contamination with
micro-organisms and the like upon contact with the patient's bodily
fluids. Unfortunately, movement of the surgeon's hands during
surgery generally results in gradually rolling down of the glove at
the cuff, which is typically only held in place by the stretch of
the latex. The gradual rolling down of the glove results in
exposure of the surgeon's skin around the wrist area, requiring
immediate attention during surgery.
[0004] Gloves are double-donned when an additional barrier layer is
desired. If the outer glove gets cut, torn, or pricked, the surgeon
or other user can simply remove the outer glove without having to
wash his or her hands and don gloves all over again. Therefore, the
ability of a glove to be double-donned is extremely important. Good
double-donning properties are achieved when the inside surface of
the outer glove and outside surface of the inner glove are smooth
such that they can easily slide against each other. However, the
outside surface of the glove should not be too smooth, as this
would result in poor gripping properties, causing difficulty when
holding/handling instruments, such as surgical instruments.
Therefore, the outside surface of the glove should have a certain
level of tackiness for providing good grip properties and yet not
cause difficulty in double gloving to the user. In addition, the
inside surface of the glove should be as smooth as possible.
[0005] The processes of donning and flexing of a glove during use
involve stretching. Therefore, it is also important that the glove,
in particular a medical/surgical glove, be stretchable, i.e., have
a tensile strength sufficient to prevent tearing or breakage during
donning or use. Any coatings applied to the glove for donnability
should not interfere with the tensile strength and stretchability
of the rubber elastomer of the glove.
[0006] Other important properties of gloves, particularly surgical
gloves, include a good, comfortable feel during use. In order to
achieve this, the gloves must fit well without bagginess contouring
the shape of the hand. The gloves should stretch uniformly over the
surface of the hands. Otherwise, the gloves will pinch the hands.
Proper glove fit is achieved by using a former in the shape of the
hand to form the glove and soft and stretchable elastomeric
materials, so that the hands experience the least amount of stress
during use. Unfortunately, soft materials, such as natural rubber
and polyisoprene, are inherently tacky and, therefore, require a
surface treatment, such as chlorination, siliconization, or a
polymer coating to circumvent the tackiness, thereby providing easy
donning.
[0007] Tackiness can be minimized and dry- and wet-donning
properties can be improved with powder, halogenation, e.g.,
post-chlorination, or a polymeric coating. U.S. Pat. No. 3,411,982
to Kavalier et al. and U.S. Pat. No. 3,740,262 to Agostinelli
disclose that halogenation, such as by post-chlorination, makes the
surface of rubber gloves slippery. Agostinelli discloses the use of
powder on the inside surface. U.S. Pat. No. 4,304,008 to Joung
discloses the use of halogenated natural rubber as the inside layer
of the glove and a halogen-resistant silicone as the outside layer
of the glove. U.S. Pat. No. 5,534,350 to Liou discloses the use of
a waterproof skin-contacting layer of polyurethane polymer on the
inside surface of the glove. U.S. Pat. No. 6,019,922 to Hassan et
al. discloses powder-free medical gloves, the inside surfaces of
which are coated with a cross-linked layer formed from a polymer or
copolymer mixed with a micronized high-density polyethylene
material and wax to provide improved lubricity. U.S. Pat. No.
6,306,514 to Weikel et al. discloses slip-coated elastomeric
flexible articles and a method of making them. The lubricant
contains an acetylenic diol and an organo-modified silicone, an
amino-modified silicone, or a cationic surfactant. A powder-free
glove can be made without chlorination using a coagulant system as
disclosed in U.S. Pat. No. 6,352,666 to Nile et al. U.S. Pat. Nos.
6,347,408 and 6,582,788 to Yeh disclose gloves with
silicone-impregnated cross-linked polyurethane inner coatings
providing good donnability. Acrylic emulsion coatings are disclosed
in U.S. Pat. No. 5,712,346 to Lee. Rubber articles are coated with
a powder-free/non-tacky coating, which is a copolymer formed by the
sequential polymerization of two mixtures of monomers of styrene,
alkyl acrylates, acrylic acid, methacrylic acid, and a silicone
oligomer. The sequential polymerization of the two-monomer mixtures
produces a core copolymer surrounded by a shell copolymer, in which
the two copolymers have differing glass transition temperatures.
U.S. Pat. No. 6,284,856 to Lee discloses acrylate, silicone,
styrene, and urethane copolymer coatings for natural and synthetic
rubber articles to provide improved mold-release characteristics,
improved donning characteristics, and improved tactile feel. The
co-polymer is formed by the polymerization of a low surface-energy
monomer, an alkyl crylate, a hard monomer, and a urethane oligomer,
preferably formed by a sequential polymerization process. U.S. Pat.
No. 6,709,725 to Lai et al. discloses an elastomeric article made
from a natural/synthetic rubber coated with a blend of a
film-forming polymer and a wax. The article has improved lubricity
and exhibits enhanced donning with respect to dry, damp and wet
hands.
[0008] While the art has successfully combated the tackiness of
natural/synthetic latex articles, there remains a need for gloves,
which provide non-tackiness at the skin-contacting surface, while
simultaneously providing stickiness at the interior surface of the
cuff in order to adhere the glove firmly to the sleeve of a
garment, thereby preventing roll-down of the glove. It is an object
of the present invention to provide such a glove. It is another
object of the present invention to provide a method of making such
a glove. These and other objects and advantages of the present
invention will become apparent from the detailed description
provided herein.
BRIEF SUMMARY OF THE INVENTION
[0009] The present invention provides a dipped and cured latex
glove article comprising an integral glove region and a cuff
region. The integral glove region comprises an inner glove surface
and an outer glove surface. The cuff region comprises an inner cuff
surface and an outer cuff surface. The inner glove surface is
coated with a non-tacky lubricious polymeric coating, whereas said
inner cuff surface is not coated and is left in the dipped and
cured latex state, which is tacky. The outer glove surface and the
outer cuff surface are treated to minimize the tackiness of the
dipped and cured latex state. Consequently, the inner glove surface
enables easy dry- and wet-donning of the glove, and the tacky inner
cuff surface adheres to a fabric sleeve when the glove is donned
over the end of the sleeve.
[0010] The present invention also provides a dipped and cured latex
glove article made from a synthetic latex comprising nitrile,
styrene-isoprene-styrene block co-polymer, chloroprene, or a
combination of one or more of the foregoing. The inner glove
surface and inner cuff surface are coated with synthetic
polyisoprene, which is tacky. The inner glove surface is then
coated with a non-tacky lubricious polymeric coating, whereas the
inner cuff surface is not coated and is left tacky. The outer glove
surface and the outer cuff surface are treated to minimize the
tackiness of the dipped and cured latex state.
[0011] Accordingly, the present invention also provides a method of
making a latex glove article comprising an integral glove region
and a cuff region. The method comprises:
[0012] (i) dipping a coagulant-coated glove former into an aqueous
latex emulsion, thereby forming a latex first layer on the
former,
[0013] (ii) partially coating the latex first layer on the former
with a non-tacky aqueous polymeric emulsion, thereby forming a
second layer on top of the latex first layer in the integral glove
region but not in the cuff region of the latex glove article,
[0014] (iii) heating the former with the first layer and the second
layer to cure the first layer with the second layer, after which
the cuff region remains tacky and the integral glove region becomes
non-tacky,
[0015] (iv) stripping from the former and inverting the latex glove
article,
[0016] (v) washing the latex glove article to remove coagulant,
aqueous latex surfactants, stabilizers, pH modifiers, and offensive
proteins,
[0017] (vi) dressing the inverted latex glove article on a glove
former such that the surface of the glove with the tacky cuff
region and the non-tacky integral glove region contacts the
former,
[0018] (vii) treating the surface of the latex glove article, which
is not in contact with the former and which comprises a tacky
integral glove region and a tacky cuff region, to minimize
tackiness,
[0019] (viii) stripping the latex glove article from the
former,
[0020] (ix) washing the latex glove article to remove any residue
from (vii), and
[0021] (x) drying the latex glove article at 80.degree. C. for 1
hr. The method can further comprise packaging the latex glove
article. The packaged latex glove article then can be sterilized by
exposing the packaged latex glove article to gamma radiation.
[0022] The present invention also provides a method of making a
synthetic latex glove article. The method comprises:
[0023] (i) dipping a coagulant-coated glove former into an aqueous
synthetic latex emulsion comprising nitrile, synthetic
styrene-isoprene-styrene block co-polymer, chloroprene, or a
combination of one or more of the foregoing, thereby forming a
latex first layer on the former,
[0024] (ii) dipping the former with the latex first layer into a
synthetic polyisoprene latex emulsion, thereby forming a latex
second layer on top of the latex first layer in the integral glove
region but not in the cuff region of the latex glove article,
[0025] (iii) partially coating the first layer and the second layer
on the former with a non-tacky aqueous polymeric emulsion, thereby
forming a third layer on top of the latex first layer and the latex
second layer in the integral glove region but not in the cuff
region of the latex glove article,
[0026] (iv) heating the former with the first layer, the second
layer, and the third layer to cure the first layer, the second
layer, and the third layer together, after which the cuff region
remains tacky and the integral glove region becomes non-tacky,
[0027] (v) stripping from the former and inverting the latex glove
article,
[0028] (vi) washing the latex glove article to remove coagulant,
aqueous latex surfactants, stabilizers, pH modifiers, and offensive
proteins,
[0029] (vii) dressing the inverted latex glove article on a glove
former such that the surface of the glove with the tacky cuff
region and the non-tacky integral glove region contacts the
former,
[0030] (viii) treating the surface of the latex glove article,
which is not in contact with the former and which comprises a tacky
integral glove region and a tacky cuff region, to minimize
tackiness,
[0031] (ix) stripping the latex glove article from the former,
[0032] (x) washing the latex glove article to remove any residue
from (viii), and
[0033] (xi) drying the latex glove article at 80.degree. C. for 1
hr. The method can further comprise packaging the latex glove
article. The packaged latex glove article then can be sterilized by
exposing the packaged latex glove article to gamma radiation.
DETAILED DESCRIPTION OF THE INVENTION
[0034] The present invention is predicated on the discovery that a
fabric-adherent internal cuff region can be generated during the
process of dipping a glove former in latex. The fabric-adherent
internal cuff is beneficial inasmuch as it adheres to the outer
surface of the sleeve of the garment of the wearer, such as the
sleeve of a surgical gown or scrubs of a surgeon, thereby
preventing roll-down of the glove and the spread of germs, which
necessitates re-washing and donning of new gloves. The
fabric-adherent internal cuff region is generated in a
manufacturing process in which an easy donning coating is applied
to the interior surface of the glove to a controlled level, thereby
leaving the uncoated internal cuff region of the glove in its
natural tacky state. The process also ensures that the tacky state
of the fabric-adherent internal cuff region is protected during
treatment to remove the tackiness of the outer surface of the
glove.
[0035] Thus, the present invention provides a dipped and cured
latex glove article comprising an integral glove region and a cuff
region. The integral glove region comprises an inner glove surface
and an outer glove surface. The cuff region comprises an inner cuff
surface and an outer cuff surface. The inner glove surface is
coated with a non-tacky lubricious polymeric coating for ease of
donnability on a dry or wet hand, whereas the inner cuff surface is
not coated and is left in the dipped and cured latex state, which
is tacky. The outer glove surface and the outer cuff surface are
treated to minimize the tackiness of the dipped and cured latex
state and to provide friction for handling of instruments, such as
surgical instruments, without slippage. The inner glove surface
enables easy dry- and wet-donning of the glove, and the tacky inner
cuff surface adheres to a fabric sleeve when the glove is donned
over the end of the sleeve.
[0036] The inner cuff region has a width of about 0.5 cm to about
10 cm. Preferably, the inner cuff region has a width of about 1 cm
to about 3 cm.
[0037] The latex can be natural or synthetic. An example of a
natural latex is polyisoprene. Examples of synthetic latex include
polyisoprene, nitrile rubber, styrene-isoprene-styrene block
co-polymer, and chloroprene, or a combination of one or more of the
foregoing.
[0038] The degree of tackiness exhibited is a function of the type
of latex and the composition of the aqueous latex emulsion. For
example, natural rubber latex and synthetic polyisoprene latexes
exhibit the highest level of tackiness in the as-dipped and cured
condition and require substantial surface character modification to
produce an easy-to-don glove. Nitrile, synthetic
styrene-isoprene-styrene block co-polymer, and polychloroprene
latexes have a lower degree of tackiness. Furthermore, the addition
of silicone and other oligomeric constituents can decrease the
tackiness. Synthetic polyisoprene, chloroprene, nitrile, and
synthetic styrene-isoprene-styrene block co-polymer latexes are
devoid of offensive proteins normally present in natural rubber
latex and are commonly used when allergic reaction is a factor in
the application of gloves. Irrespective of the latex composition
used, the inner surface of the cuff region of the glove is retained
in its original dipped and cured state so as to provide fabric
adherence.
[0039] The non-tacky lubricious polymeric coating of the inner
glove surface is a cured dip-coated film-forming polymeric
emulsion. The emulsion can additionally comprise a wax and a
surfactant. The emulsion can be an aqueous polyurethane polymeric
emulsion, an aqueous acrylic polymeric emulsion, or an aqueous
siliconized polymeric emulsion comprising silicone particles.
[0040] In one embodiment, a dipped and cured synthetic latex glove
is provided. The synthetic latex comprises nitrile,
styrene-isoprene-styrene block co-polymer, chloroprene, or a
combination of one or more of the foregoing. The inner glove
surface and inner cuff surface are coated with synthetic
polyisoprene, which is tacky. The inner glove surface is then
coated with a non-tacky lubricious polymeric coating, whereas the
inner cuff surface is not coated and is left tacky. The outer glove
surface and the outer cuff surface are treated to minimize the
tackiness of the dipped and cured latex state.
[0041] Accordingly, the present invention also provides a method of
making a latex glove article comprising an integral glove region
and a cuff region. The method comprises dipping a coagulant-coated
glove former into an aqueous latex emulsion, which is locally
destabilized by the coagulant, thereby forming a latex first layer
on the former. The method further comprises partially coating the
latex first layer on the former with a non-tacky aqueous polymeric
emulsion, thereby forming a second layer on top of the latex first
layer in the integral glove region but not in the cuff region of
the latex glove article. The second layer can be applied by
partially dipping the former with the latex first layer into the
non-tacky aqueous polymeric emulsion or by selectively spraying the
non-tacky aqueous polymeric emulsion onto the first latex layer. By
"selectively" is meant spraying in the integral glove region but
not in the cuff region of the latex glove article. Preferably, the
second layer is applied by partial dipping. Preferably, the former
with the latex first layer is dipped into the non-tacky aqueous
polymeric emulsion with the glove fingers pointing downwards up to
but not including the cuff region. The cuff region can be about 0.5
cm to about 10 mm, preferably about 1 cm to about 3 cm. The method
then comprises heating the former with the first layer and the
second layer to cure the first layer with the second layer, after
which the cuff region remains tacky and the integral glove region
becomes non-tacky. The non-tacky polymeric second layer is
generally compatible with the latex first layer, having similar or
better stretch characteristics, and the first and second layers do
not separate at their interface, even when the latex article is
stretched. If desired, the non-tacky polymeric second layer can be
coated with a hand-friendly lubricious coating, which preserves
skin moisture, as described in co-pending U.S. Patent Application
No. ______, entitled "Glove With Hand-Friendly Coating and Method
of Making," filed Dec. 1, 2005 (Applicants: Eng et al., Attorney
Docket No. P2563US), which is hereby incorporated by reference in
its entirety. The glove article is then stripped from the former
and inverted, after which the glove article is washed to remove
coagulant, aqueous latex surfactants, stabilizers, pH modifiers,
and offensive proteins. The method then comprises dressing the
inverted latex glove article on a glove former, such that the
surface of the glove with the tacky cuff region and the non-tacky
integral glove region contacts the former, and treating the surface
of the latex glove article, which is not in contact with the former
and which comprises a tacky integral glove region and a tacky cuff
region, to minimize tackiness and improve friction properties.
Tackiness can be minimized and friction properties can be improved
by treating with a chlorination solution (see, e.g., Example 1), by
siliconization, or by coating with a polymer. Siliconization is
generally accomplished by treating a surface, the tackiness of
which is to be minimized, with a silicone-containing emulsion or a
solution, depending on the solubility of the siliconizing
composition. Water-insoluble siliconizing compositions are
emulsified, while siliconizing compositions that have a hydroxyl
group are water-soluble and are dissolved in an aqueous treating
solution. The method further comprises stripping the latex glove
article from the former, washing the latex glove article to remove
any residue, such as chlorine reaction residue, and drying the
latex glove article at 80.degree. C. for 1 hr. The elasticity of
the glove results in a tight contact between the glove and the
former, such that the chlorination solution, for example, does not
leak between the glove and the former, which would result in the
destruction of the tackiness of the cuff region.
[0042] The method can further comprise packaging the latex glove
article in pairs or in bulk. If desired, the packaged latex glove
articles can be sterilized by exposing the packaged latex glove
articles to gamma radiation.
[0043] The present invention also provides a method of making a
synthetic latex glove article comprising an integral glove region
and a cuff region. The method comprises dipping a coagulant-coated
glove former into an aqueous synthetic latex emulsion comprising
nitrile, synthetic styrene-isoprene-styrene block co-polymer,
chloroprene, or a combination of one or more of the foregoing,
thereby forming a latex first layer on the former, and then dipping
the former with the latex first layer into a synthetic polyisoprene
latex emulsion, thereby forming a latex second layer on top of the
latex first layer in the integral glove region but not in the cuff
region of the latex glove article. The method further comprises
partially coating (partially dipping or selectively spraying as
described above) the first layer and the second layer on the former
with a non-tacky aqueous polymeric emulsion, thereby forming a
third layer on top of the latex first layer and the latex second
layer in the integral glove region but not in the cuff region of
the latex glove article, and heating the former with the first
layer, the second layer, and the third layer to cure the first
layer, the second layer, and the third layer together, after which
the cuff region remains tacky and the integral glove region becomes
non-tacky. The glove is then stripped from the former and inverted.
The glove is then washed to remove coagulant, aqueous latex
surfactants, stabilizers, pH modifiers, and offensive proteins and
dressed onto a glove former such that the surface of the glove with
the tacky cuff region and the non-tacky integral glove region
contacts the former. The method then further comprises treating
(chlorination, siliconization or polymer coating as described
above) the surface of the latex glove article, which is not in
contact with the former and which comprises a tacky integral glove
region and a tacky cuff region, to minimize tackiness, stripping
the latex glove article from the former, washing the latex glove
article to remove any residue, such as chlorine reaction residue,
and drying the latex glove article at 80.degree. C. for 1 hr. This
method generates a fabric-adherent cuff region even when the latex
first layer is not so tacky due to the type and composition of
latex used. Such gloves are chemically resistant and useful in
chemotherapeutic applications and the like.
[0044] This method also can further comprise packaging the latex
glove article in pairs or in bulk. If desired, the packaged latex
glove articles can be sterilized by exposing the packaged latex
glove articles to gamma radiation.
[0045] With respect to the above methods, the non-tacky aqueous
polymeric emulsion can contain a film-forming polymer or copolymer,
a wax, a surfactant and a hardness modifier. Any suitable
film-forming polymer can be used. The film-forming polymer forms a
continuous polymeric coating that inherently bonds to the
coagulated latex surface formed on the former and creates a
substantial bond between the latex and the polymer coating during
curing. Suitable film-forming polymers or copolymers include
polyurethane and acrylic polymers and copolymers. Preferably, the
film-forming polymer or copolymer is polyurethane. Suitable
polyurethanes include aliphatic polyurethanes and aromatic
polyurethanes. Examples of suitable commercially available
polyurethanes include, but are not limited to, BEETAFIN.TM. L9009
(BIP (Oldbury) Limited, Tat Bank Road, Oldbury, West Midlands,
United Kingdom), Witcobond.TM. W-506 (Chemtura Corporation 199,
Benson Road, Middlebury, Conn.), and Neorez.TM. R-972 (DSM
Neoresins, Sluisweg 12, 5140 AC Waalwijk, The Netherlands).
[0046] Acrylic polymers and copolymers can be polymerized from a
monomer mixture including at least one reactive (co-polymerizable)
low surface energy monomer, preferably a silicone oligomer, at
least one alkyl acrylate, at least one reactive (co-polymerizable)
aliphatic urethane oligomer, and at least one reactive
(co-polymerizable) hard monomer.
[0047] The film-forming polymeric emulsion can include a
silicone-modified polymer in combination with silicone resin
particles so as to provide a non-tacky polymeric layer.
Silicone-modified polymers that can be used include those polymeric
structures that can have silicone groups covalently attached to the
chemical structures. Suitable silicone-modified polymers include,
but are not limited to, silicone-modified polyurethanes, acrylics,
vinyl, alkyl, esters, ethylene propylene diene rubber (EPDM), and
nitrites. Preferred silicone-modified polymers are
silicone-modified polyurethanes.
[0048] Any suitable wax can be used. The wax is generally insoluble
in the aqueous coating emulsion, and a fine dispersion of the
water-insoluble wax component provides regions in the coatings that
provide lubricity and non-tackiness within the coating layer. The
wax is preferably a synthetic polymer or copolymer wax, more
preferably a polyethylene wax, a high-density polyethylene wax, an
oxidized or modified polyethylene wax or high-density polyethylene
wax, or a mixture of two or more of such waxes. Preferably, the wax
has a melting point of 80.degree. C. or more, more preferably the
wax is a polyethylene wax having a melting point of 80.degree. C.
or more. Examples of suitable commercially available polyethylene
waxes include, but are not limited to, AQUAMAT.TM. 213 (BYK-Chemie,
Wesel, Germany), MICHEM LUBE.TM. 61335 (Michelman, Inc.,
Cincinnati, Ohio), and AQUACER.TM. 502 (BYK-Chemie, Wesel,
Germany).
[0049] The ratio of film-forming polymer to wax is preferably at
least about 0.5 to 1 up to about 20 to 1. The film-forming polymer
and the wax are dispersed in water in the presence of one or more
surfactants. There is a wide range of commercially available
non-ionic and anionic surfactants including, for example, those
sold under the trademarks DARVAN.TM. (R.T. Vanderbilt Company, Inc,
30 Winfield Street, Norwalk, Conn.) and SYNPERONIC.TM. (Uniqema,
Wilmington, Del.).
[0050] Any suitable hardness modifier can be used. The hardness
modifier increases the hardness of the polymeric non-tacky coating.
Suitable hardness modifiers can be selected from polymeric
compounds including, but not limited to,
poly(2-hydroxyethylmethacrylate), acrylic polymers, and
melamine-formaldehyde resins. Preferably, the hardness modifier is
a polymer or copolymer having a glass transition temperature higher
than that of the film-forming polymer.
[0051] In view of the foregoing, when gloves are to be
double-donned, a glove with a fabric-adherent cuff region is donned
first, such that the fabric-adherent cuff region is over the
sleeve. A second glove, which does not have a fabric-adherent cuff
region, is then donned second. Since the cuff region of the second
glove contacts the already anchored cuff region of the first glove,
due to the present of the fabric-adherent cuff region, the second
glove also does not roll.
EXAMPLES
[0052] The following examples serve to illustrate the present
invention and are not intended to limit its scope in any way.
Example 1
[0053] This example describes the preparation of a glove in
accordance with the present invention.
[0054] A surgical glove former was dipped into an aqueous coagulant
containing 20% calcium nitrate, 5% calcium carbonate powder, 0.1%
Teric 340 (Huntsman, 500 Huntsman Way, Salt Lake City, Utah), and
0.2% cellusize QP30,000 (Union Carbide, Danbury, Conn.), and dried
on the former. The glove was then dipped into pre-vulcanized
natural rubber latex with 35% total solid content to form a gelled
rubber layer. The glove on the former was leached in hot water at
60.degree. C. for 5 min. The glove was then dipped into an aqueous
dispersion containing 10% Beetafin L9009 (BIP (Oldbury) Limited,
Tat Bank Road, Oldbury, West Midlands, United Kingdom) 3% Aquamat
213 (BYK-Chemie, Wesel, Germany), and 1% Cymel 373 (Cytec
Industries, 1405 Buffalo Street, Olean, N.Y.) up to a level of 3 cm
from the edge of the cuff of latex film to form a thin polymeric
lining extending from 3 cm below the edge of the cuff. The portion
of the glove not coated by the aqueous dispersion retains the
natural tackiness of latex, thereby forming the fabric-adherent
cuff region. The glove on the former was then heated and cured in
an oven at 130.degree. C. for 10 min, after which it was leached in
hot water at 80.degree. C. for 30 seconds, dried, and stripped from
the former and reversed. The glove was rinsed with water to remove
calcium carbonate powder. The outer surface of the glove was
treated with 0.5 g/l chlorine water for 10 sec, rinsed with water,
dried to completion at 70.degree. C. for 80 min, packed, and
sterilized with gamma irradiation.
Example 2
[0055] This example demonstrates the superiority of gloves with a
fabric-adherent cuff region.
[0056] In order to measure cuff roll-down resistance, a sleeve of a
disposable surgeon's gown was first put on a former having the
shape of a human arm. The glove was then put on the arm former with
the cuff covering part of the gown's sleeve. The glove was then
pulled at a constant speed to detach from the gown's sleeve. The
force required was measured as cuff pull force, i.e., the amount of
force required to detach the glove from the sleeve. Three separate
gloves with fabric-adherent cuff regions evidenced pull forces of
4.0, 4.2 and 4.4 kg, whereas a glove without a fabric-adherent cuff
region evidenced a pull force of only 1.0 kg. Thus, this example
demonstrates that the fabric-adherent cuff resists cuff roll-down
as evidenced by the cuff pull force. Cuff pull force was poor in
the absence of a fabric-adherent cuff.
[0057] All references, including publications, patent applications,
and patents, cited herein are hereby incorporated by reference to
the same extent as if each reference were individually and
specifically indicated to be incorporated by reference and were set
forth in its entirety herein.
[0058] The use of the terms "a" and "an" and "the" and similar
referents in the context of describing the invention (especially in
the context of the following claims) are to be construed to cover
both the singular and the plural, unless otherwise indicated herein
or clearly contradicted by context. Recitation of ranges of values
herein are merely intended to serve as a shorthand method of
referring individually to each separate value falling within the
range, unless otherwise indicated herein, and each separate value
is incorporated into the specification as if it were individually
recited herein. All methods described herein can be performed in
any suitable order unless otherwise indicated herein or otherwise
clearly contradicted by context. The use of any and all examples,
or exemplary language (e.g., "such as") provided herein, is
intended merely to better illuminate the invention and does not
pose a limitation on the scope of the invention unless otherwise
claimed. No language in the specification should be construed as
indicating any non-claimed element as essential to the practice of
the invention.
[0059] Preferred embodiments of this invention are described
herein, including the best mode known to the inventors for carrying
out the invention. It should be understood that the illustrated
embodiments are exemplary only, and should not be taken as limiting
the scope of the invention.
* * * * *